Value Collection 39640 Hex Lock Nut 9/16-18 Grade 8

Product Description

The VALUE COLLECTION 39640 is a 9/16-18 UNF hex lock nut with a nylon insert locking style, manufactured from Grade 8 steel with a bright, uncoated finish. The nylon insert provides prevailing-torque resistance, preventing the nut from loosening under vibration or dynamic load without requiring a separate locking element. Standing 41/64 inches high with a 7/8-inch width across the flats, this right-hand-thread fastener is sized for standard wrenching with common hand and power tools. It is suited for mechanical assemblies, structural connections, and equipment mounting applications where a reliable, reusable locking fastener is required.

This hex lock nut is used across a wide range of trade and industrial applications including HVAC equipment mounting, electrical panel and enclosure assembly, plumbing fixture installation, and general mechanical fabrication. The 9/16-18 UNF thread is a fine-pitch designation commonly found on structural fastener assemblies and equipment frames. Licensed tradespeople and fabricators working with Grade 8 fastener assemblies will find this nut compatible with standard UNF bolt and stud configurations of the same thread size and direction.

Key Features

• Nylon insert locking style provides prevailing-torque resistance without additional hardware
• Grade 8 steel construction for high tensile strength in demanding applications
• 9/16-18 UNF right-hand thread for compatibility with fine-pitch fastener assemblies
• Bright, uncoated finish suitable for dry or protected indoor environments
• 7/8-inch width across flats accepts standard combination and box-end wrenches

Compatibility

Designed as a standard UNF hex lock nut for use with 9/16-18 right-hand-thread bolts and studs in Grade 8 fastener assemblies. No specific model or system compatibility was stated in the product data.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson familiar with fastener torque requirements for Grade 8 hardware. De-energize or shut down any equipment before accessing fastener assemblies. The nylon insert may be compressed on initial installation, so verify thread engagement is complete before final tightening. Reuse of nylon insert lock nuts should be evaluated per the applicable fastener standard or job specification, as repeated cycling can reduce locking effectiveness.